Jet-washing apparatus



Aug. 18. 1925. 1,550,337

G. A. H. BOLLMANN JET WASHING APPARATUS Filed Dec. 22, 1923 [HI enrol"#50/0710/7/7 firs.

. within the Patented Aug. 18, 1925.

UNI-T E D S TA TBS PATENT OFF! JET-WASHING APPARATUS.

Application filed December 22, 1923'. Serial No. 682,262.

To all whom it may concern:

Be it known that I, Gnone ANonnAs HEINRICH Bommrann, a citizen ofGermany, residing at Hamburg, Gertrudenkirchhof 21, Germany, haveinvented certain new and useful Improvements in a Jet-ViashingApparatus, of which the following is a specification.

In filters working with granularfilter materials, such as sand, graveland the'like, is necessary now and then to clean or ash t is filtermaterial,-which is carried out by the aid of jets of water or otherwashing liquid that is squirted into the'lilter material by the aid ofone or more nozzles. It has been frequently observed that, as soon asthe com-pressed washing liquid is shutoff, sand or other filter materialpasses by way of the nozzle intothe feed pipe forthe compressed liquid.To obviate this incon venience divers means have been proposed. Conicalor otherwise shaped screens, forminga'fsort" of lilter-sieve,-have beenarranged feed pipe near the jet nozzle to hold back any granular filtermaterial, that might tend to enter the feed pipe through the nozzle."These means however have'not fully answered their purpose, and now andthen a choking up of the feed pipe happened. Particularly for largefilters, in which the pressure of the sand againstthe mouth of thenozzle is considerable, the described drawback was found to be veryserious. Neither jet washing apparatus of such description, in whichbetween the nozzle and the feed pipe proper a sand seal is formed by thefilter material itself which seal is pressed away on thecompressedliquid being turned on, and which on shutting off thecompressed liquidis again created by the weight of the filter material,nor jet washing apparatus in which a dish shaped sand trap withinthe'nozzle pipe is arranged for catchingup the returning sand in suchmanner,- that the narrow space between the nozzle opening and the dishbecomes clogged in order to prevent a further entering of sand into thefeed pipe, operate by any means with sufiieient reliability, since thedanger of the accumulating sand. within the sand seal or on' the dishshaped sand trap increasing to such an extent that some of itnevertheless enters the feed pipe, is by no means removed.

The objectof the present invention is to construct a jet washingapparatus which is well adapted even for the largest filters. \Viththisobject in view a valve is provided within the feed pipe, adapted to shutthe nozzle carried by the end of the feed pipe. This valve is preferablycone shaped and is connected with a valve rod, passing with its upperend through a dish shaped sand trap. The conical valve is of sufficientlength to reach with its vertex approximately up to the mouth of thenozzle when in open position. The lower end of the nozzle, forming theseat of this valve, is roundedolt at its rim, and by these meanstogether with the shape of the cone a perfoot closure is attained, evenif large amounts of sand rest on the 'mouth of the,

nozzle. The amount of sand, passing the valve onits movement, is verysmall and does not change to any degree worth spealo ing of. Thesandtrap, once given the proper dimensions, takes up tie surplus of thesand under all working conditions and thus prevents any of the filtermaterial from, passing into the feed pipe.

The rod carrying the valve passes through a stufiing box in the wall ofthe bend forming the end of the feed pipe and is here connected with adouble ned lever movably fulcrumed outside of the pipe and adapted to beoscillated by hand or other wise.

hen the filter is out of use for a long time it might happen, that theconical valve will not be sufficient to loosen theomass of sand, bearingagainst it, and special means may be provided for stirring up the sand.The invention therefore provides such means consisting of a cylindricalperforated mantle surrounding the end of the feed pipe, carrying the jetnozzle and forming an annular space around the said end of the feedpipe.- said space with the interior of the feed pipe or with anauxiliary pipe allows compressed liquid to enter the said annular space,which liquid passes out through the perforations of the said mantle toact on the sand accumulated around the extreme end of the feed pipe,thus stirring it up and assisting the conical valve; in its operation.

, In the drawing a section of the jet washing apparatus is shown adaptedto wash filter material used in sand filters or the like.

The feed pipe is shaped as an elbow 1 carrying at its upper end a dome 2with a A conduit connecting the nozzle 3. The lower opening of thisnozzle is rounded oil at the edge to form a seat for the cone shapedvalve 4. The valve rod 6 on this valve passes through a dish shaped sandtrap 5 arranged below the nozzle 3 to guide the valve centrally to thenozzle, the valve being of such length as to project with its vertexinto or approximately up to the mouth of the nozzle. Owing to the lowerend of the nozzle being rounded off, the valve in closed position willcontact with the thus formed seat only in a line. At its lower end thevalve rod 6 passes through a stufling box formed on the wall of theelbow. The outer projecting end of the valve rod is pivotally connectedat 8 with a double armed lever 9 having a handle 19 at its free end, apivot pin 10 of which passes through the end of a link 12 which ispivotally connected with a bracket 11. The valve 4 is closed by movingthe lever 9 downwards by its handle before the compressed washing liquidis shut oil. The nozzle 3 and dome 2 are embedded in the filteringmaterial.

The dome shaped end 2 of the feed pipe is surrounded by a cylindricalperforated mantle 13 forming an annular space 20, which by the aid of aconduit 15 is adapted to communicate with the interior of the bend 1 andwith auxiliary water feed pipes 16. The perforations of the mantle 13are preferably created by punching out inclined nose shapedprotuberances 14 to prevent sand from entering the annular space 20. Theopening 17 of the conduit 15 can be closed by a valve 21, if it is notdesired to allow compressed liquid to enter the space 20 from thebend 1. Vhen the liquid enters the annular space 20 it runs out throughthe nose like openings 14 and loosens the sand above the nozzle 3.

I claim:

1. A jet washing apparatus for filters comprising a feed pipe forcompressed liquid. a nozzle at the end of the feed pipe, a sand trapbelow the nozzle, and a valve movable within the feed pipe above thesand trap and adapted to shut the opening of said nozzle.

2. A jet washing apparatus for filters comprising a feed pipe forcompressed liquid. a nozzle at the end of the feed pipe, a sand trapbelow the nozzle, and a conical valve movable within the feed pipe abovethe sand trap and adapted to shut the opening of said nozzle which isshaped to form a seat for said valve.

3. A jet washing apparatus for filters comprising a feed pipe forcompressed liquid, a nozzle at the end of the feed pipe, a sand trapbelow the nozzle, and a cone shaped valve movable within the feed pipeabove the sand trap and adapted to shut the opening of said nozzle,which opening is rounded off at its lower rim to form a seat for saidvalve the cone shaped valve being of such a length as to reach with itsvertex approximately to the mouth of the nozzle in the open position.

4. A jet washing apparatus for filters comprising a feed pipe forcompressed liquid. a nozzle at the end of the feed pipe, a sand trapbelow the nozzle. a valve movable within the feed pipe above the sandtrap and adapted to shut the opening of said nozzle, and a valve rodcarrying the said valve and adapted to be operated by hand from outside.

5. A jet washing apparatus for filters comprising a bend forming a feedpipe for compressed liquid, a nozzle at the upper end of the bend, asand trap below the nozzle, a rod passing through said sand trap withone end and out through the wall of the bend with its other end, a valvecarried by the first named end of the rod and adapted to shut theopening of said nozzle, and a double armed lever fulcrumed outside onthe bend and rotatably connected with the end of the rod projecting out.

6. A jet washing apparatus for filters comprising a feed pipe forcompressed liquid. a nozzle at the end of the feed pipe a sand trapbelow the nozzle, a valve movable within the feed pipe above. the sandtrap and adapted to shut the opening of said nozzle, a perforated mantlesurrounding the upper end of the feed pipe and constituting an annularspace between the feed pipe and the mantle, a conduit connecting thesaid annular space with the feed pipe and a hand operated valve withinsaid conduit.

7. A jet washing apparatus for filters comprising a feed pipe forcompressed liquid, a nozzle at the end of the feed pipe, a sand trapbelow the nozzle, a valve movable within the feed pipe above the sandtrap and adapted to shut the opening of said nozzle, a perforated mantlehaving inclined noses covering the perforations, and surrounding theupper end of the feed pipe and spaced therefrom to leave an annularspace between the feed pipe and the mantle, a conduit connecting theannular space with the feed pipe, and a valve for controlling theconduit.

GEORG ANDREAS HEINRICH BOLLIVIANN.

